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Home server bottleneck (filesystem server)Really, I think the bottle neck for hosting virtual machines on a raspberry pi is the CPU--it's single threaded. This means that each of your VM's is contending with each other, the rest of the server processes, and the kernel for CPU time on the single core. Make sure that there's a real server core backing each of your virtual cores. Also, the memory size is low, so your disk cache is also going to be small, so you'll spend more time then normal doing disk I/O, which is super slow over USB. If you have a place for one, you can buy cheap server refurbs off ebay--like a DL360 G5.